function service(target, domain, host, alias) {
	return {
		target: target,
		domain: domain,
		host: hosts[host],
		alias: alias,
		record: function() {
			return my_host_record(this.target, this.resolve_host());
		},
		resolve_host: function() {
			if (this.alias) {
				return services[this.alias].resolve_host();
			}
			return this.host;
		}
	};
}

function collect_services(domain) {
	var result = [];
	for (var key in services) {
		var s = services[key];
		if (s.domain == domain) {
			result.push(s.record());
		}
	}
	return result;
}

function my_host_record(target, host) {
	return [
		A(target, host.ipv4_address),
		AAAA(target, host.ipv6_address)
	];
}

function verify_amazon_ses(dkims) {
	var result = [];
	for (var i in dkims) {
		var my_dkim = dkims[i] + "._domainkey";
		var ses_dkim = dkims[i] + ".dkim.amazonses.com.";
		result.push(CNAME(my_dkim, ses_dkim));
	}
	return result;
}

function acme_challenge(subd, target) {
	var final_subd = "_acme-challenge";
	if (subd) {
		final_subd += "." + subd;
	}

	final_target = target + ".acme.serguzim.me.";

	return CNAME(final_subd, final_target);
}

function verify_dmarc_reports(domains) {
	var result = [];
	for (d in domains) {
		result.push(TXT(d + "._report._dmarc", "v=DMARC1"));
	}
	return result;
}